DE102016124571B4 - Sealing device and seal arrangement - Google Patents

Abstract

A sealing arrangement (20) for a wheel bearing arrangement, comprising a bearing element (21) and a sealing device (1) for sealing two bearing elements rotating about an axis (D) relative to one another, the sealing device (1) comprising: - a sealing section (2) for sealing, and- a fixing portion (3) for holding the sealing device (1) on a bearing member (21), - wherein the sealing portion (2) at one end of the mounting portion (3) is arranged and opposite a free end (E) in which all sections (2, 3) have a common carrier element (4) and at least one sealing element (5), wherein all sections (2, 3) are in the radial direction (R) and / or in the axial direction (A) extend, - wherein the mounting portion (3) for immediate abutment of the support member (4) and the sealing element (5) on a bearing element (21) at least partially in the axial direction (A) extends to e by means of the support element (4) a clamping seat in the radial direction (R) for holding on a bearing element (21) and by means of the sealing element (5) to form a static seal for sealing against a bearing element (21) wherein the bearing element (21) in the radial direction (R) a inner (IM) and an outer lateral surface (AM) and in the axial direction (A) an end face (22) which connects the inner lateral surface (IM) with the outer lateral surface (AM), - wherein for positioning the sealing device (1) whose sealing section (2) is arranged on the end face (22) of the bearing element (21) and for holding the sealing device (1) whose attachment section (3) on the inner lateral surface (IM) of the bearing element (21), whereby the carrier element (4) and the sealing element (5) in the attachment portion (3) of the sealing device (1) directly against the inner circumferential surface (IM) of the bearing element (21) to hold by means of the support member (4) a clamping seat in the radial direction (R) for holding the inner lateral surface (IM) of the bearing element (21) and by means of the sealing element (5) to form a static seal for sealing against the inner circumferential surface (IM) of the bearing element (21). characterized in that - the end face (22) of the bearing element (21) comprises a first part (23) for arranging the sealing portion (2) of the sealing device (1) and a second part (24) for forming a labyrinth seal, - Part (24) of the end face (22) at least partially surrounds the sealing portion (2) to form a labyrinth seal, - wherein the second part (24) of the end face (22) forms an annular recess to communicate with the sealing portion (2) Sealing device (1) to form a labyrinth seal, - wherein the extension (6) at least partially within the second part (24) of the end face (22) of the bearing element (21) and spaced from the second part (24) is arranged around an axial sealing gap (Y) between the extension (6) and the second part (24) of the end face (22) to cover.

Description

The invention relates to a sealing arrangement for a wheel bearing arrangement, comprising a bearing element and a sealing device for sealing two bearing elements which rotate relative to one another about an axis, in particular for sealing a roller bearing. Furthermore, the invention relates to a sealing arrangement for a rolling bearing, in particular wheel bearing assembly, with a bearing element and with a sealing device.

Conventional sealing devices or radial shaft seals form a static seal with the outer surface of the outer ring when attached to an outer ring. This protects the entire sealing device from contamination and corrosion.

In order to clamp the sealing device securely on the outer ring, this has a carrier element which bears against the inner circumferential surface of the outer ring.

Such a constellation with a static seal on the outside or on the outer lateral surface of an outer ring and a clamping on the inside or on the inner circumferential surface of the outer ring must be carefully installed.

Because assembly errors quickly lead to failure of the sealing device, if these or their static seal is not carefully mounted on the outer ring.

From the JP 2014 - 169724 A is a sealing device for sealing two about an axis relative to each other rotating bearing elements for sealing a rolling bearing known. The sealing device comprises a sealing portion for sealing, and a fixing portion for holding the sealing device on a bearing member, wherein the sealing portion is disposed at one end of the fixing portion and opposite, wherein all portions have a common support member and a sealing member, wherein all sections in extend in the radial direction or in the axial direction, wherein the attachment portion for direct abutment of the support member and the sealing member extends to a bearing member in the axial direction to by means of the support member a clamping seat in the radial direction for holding on a bearing element and by means of the sealing element, a static seal Dense to form a bearing element.

It is therefore an object of the present invention to provide a sealing device or a seal assembly for a rolling bearing, which is not only inexpensive and can be produced materially, but also improved sealing performance, especially in wheel bearing seals, and which preferably has an improved static seal against a rotating (Dirt) water volume ensured.

This object is achieved by the features of claim 1. Further advantageous developments are the subject of the dependent claims.

According to the invention comprises in a first aspect of the present invention, a sealing device for sealing two about an axis relative to each other rotating bearing elements, in particular for sealing a rolling bearing, a sealing portion for sealing and a mounting portion for holding the sealing device to a bearing element.

Preferably, the seal portion is disposed at one end of the attachment portion and includes a free end opposite.

Preferably, all sections have a common carrier element and at least one sealing element. Thus, a mechanical stability as well as a sealing function of the sealing device can be imparted.

It is also preferred if all sections extend in the radial direction and / or in the axial direction. In this way, the sealing device is almost free in its shape.

Furthermore, it is expedient for the attachment section to extend at least partially in the axial direction for direct abutment of the carrier element and the sealing element on a bearing element. In this way, by means of the carrier element, a clamping seat in the radial direction for holding on a bearing element and by means of the sealing element, a static seal for sealing against a bearing element can be formed.

Furthermore, it is preferred that the carrier element and the sealing element are arranged for immediate contact with the bearing element in the axial direction one behind the other. In other words, it is advantageous if the carrier element and the sealing element for direct contact with the bearing element in series, in particular in the axial direction, are arranged.

Furthermore, it is favorable if in the radial direction, directed from an axis of rotation of the sealing device to the outside, the sealing element, the support member in the attachment portion surmounted. Thus, a secure static seal can be ensured against a bearing element.

It can also be provided that the sealing section extends at least partially in the radial direction for direct contact of the carrier element with a bearing element. This has the advantage that a stop for positioning on a bearing element can be formed by means of the carrier element.

Furthermore, it is preferred that the sealing device has an extension on the sealing portion, which extends in the radial and / or axial direction and which is preferably formed by the sealing element.

Preferably, the extension together with the sealing portion and the attachment portion form a U-shaped cross section for receiving a bearing element.

Further, it is advantageous if the extension is arranged at the free end of the sealing portion. Thus, the extension may extend away from the free end of the seal portion in the radial and / or axial direction to form, for example, a non-contact or non-abrasive pre-seal.

It is also advantageous if the extension on the sealing section surrounds or surrounds the carrier element at the free end. Thus, the extension can protect the carrier element from corrosion, for example.

A second aspect of the present invention comprises a sealing arrangement for a roller bearing, in particular wheel bearing arrangement, with a bearing element and with a sealing device.

It is expressly understood that the features of the sealing device, as mentioned in the first aspect, can be used individually or in combination with each other in the sealing arrangement application.

In other words, the features mentioned above under the first aspect of the invention relating to a sealing device can also be combined here with further features in the second aspect of the invention.

Advantageously, the seal assembly for a rolling bearing, in particular wheel bearing assembly, as already mentioned, comprises a bearing element and a sealing device according to the first aspect of the present invention.

According to the invention, the bearing element comprises in the radial direction an inner and an outer lateral surface and in the axial direction an end side which connects the inner lateral surface with the outer lateral surface.

According to the invention, the sealing portion of which is arranged on the end face of the bearing element and for holding the sealing device whose attachment portion on the inner circumferential surface of the bearing element for positioning the sealing device. As a result, the carrier element and the sealing element in the attachment portion of the sealing device can rest directly on the inner circumferential surface of the bearing element. Thus, by means of the carrier element, a clamping seat in the radial direction for holding on the inner circumferential surface of the bearing element and by means of the sealing element, a static seal for sealing against the outer surface of the bearing element can be formed.

It is also preferred if the sealing device at the free end of the sealing portion comprises an extension which is formed by the sealing element, that between the extension and the outer surface of the bearing element results in a sealing gap, preferably the outer circumferential surface and the extension of each other, in particular in the radial direction, spaced. As a result, a non-abrasive pre-seal between the extension of the sealing device and the outer circumferential surface of the bearing element can be formed.

According to the invention, it is favorable if the end face of the bearing element comprises a first part for arranging the sealing section of the sealing device and a second part for forming a labyrinth seal.

According to the invention, the second part of the end surrounds at least partially the sealing portion to form a labyrinth seal.

Furthermore, according to the invention, the second part of the end face forms an annular recess to form a labyrinth seal with the sealing portion of the sealing device.

According to the invention, the extension is at least partially disposed within the second part of the end face of the bearing element and spaced from the second part. Thus, it is possible to cover an axial sealing gap between the extension and the second part of the front side.

An axial sealing gap is understood as meaning a sealing gap which, for example, spaces the extension and the front side of the bearing element or their second part in the radial direction.

Furthermore, it is advantageous if the second part of the front side comprises a bottom, a first and a second side part. Thus, preferably seen in cross-section, the second part of the end face on a U-shaped configuration.

Preferably, the extension is at least partially disposed within the second part of the end face of the bearing element and at a distance from the bottom of the second part of the end face. This makes it possible to cover an axial sealing gap between the extension and the bottom by means of the first side part of the second part of the front side.

It is advantageous if the axial sealing gap the bottom of the first side member spaced the extension in the axial direction.

Furthermore, it can be provided that the bearing element comprises a drainage channel for collecting and draining a lubricant.

Advantageously, the extension extends into the gutter. In this way, for example, a lubricant or dirt can always be returned by means of the extension in the gutter.

Preferably, the extension is stepped.

It is also preferred if the inner circumferential surface of the bearing element follows the shape of the extension, in particular is formed step-like.

A step-like design allows the design of a labyrinth seal.

Furthermore, it is advantageous if the extension forms a gutter, wherein preferably the gutter is formed open in the radial direction. Thus, it is possible by means of the gutter, for example, to collect dirt or a lubricant.

Conveniently, the extension surrounds the second part of the end face of the bearing element together with the sealing portion and the fastening portion. In other words, it is advantageous if seen in cross-section of the sealing portion, the attachment portion and the extension have a C- or U-shaped configuration, in which a bearing element can be arranged.

Furthermore, it is favorable if the carrier element comprises a stainless steel. Thus, corrosion can be counteracted.

• 1 eine Schnittansicht auf eine erfindungsgemäße Dichtungsanordnung mit einem Lagerelement und einer Dichtungsvorrichtung nach einem ersten Ausführungsbeispiel;
• 2 eine Schnittansicht auf eine erfindungsgemäße Dichtungsanordnung mit einem Lagerelement und einer Dichtungsvorrichtung nach einem zweiten Ausführungsbeispiel;
• 3 eine Vergrößerung aus 2;
• 4 eine Schnittansicht auf eine erfindungsgemäße Dichtungsanordnung mit einem Lagerelement und einer Dichtungsvorrichtung nach einem dritten Ausführungsbeispiel;
• 5 eine Schnittansicht auf eine erfindungsgemäße Dichtungsanordnung mit einem Lagerelement und einer Dichtungsvorrichtung nach einem vierten Ausführungsbeispiel;
• 6 eine Schnittansicht auf eine erfindungsgemäße Dichtungsanordnung mit einem Lagerelement und einer Dichtungsvorrichtung nach einem fünften Ausführungsbeispiel; und
• 7 eine Schnittansicht auf eine erfindungsgemäße Dichtungsanordnung mit einem Lagerelement und einer Dichtungsvorrichtung nach einem sechsten Ausführungsbeispiel.

The invention will be explained in more detail by means of embodiments in conjunction with accompanying drawings. These show schematically:

• 1 a sectional view of a seal assembly according to the invention with a bearing element and a sealing device according to a first embodiment;
• 2 a sectional view of a seal assembly according to the invention with a bearing element and a sealing device according to a second embodiment;
• 3 an enlargement 2 ;
• 4 a sectional view of a seal assembly according to the invention with a bearing element and a sealing device according to a third embodiment;
• 5 a sectional view of a seal assembly according to the invention with a bearing element and a sealing device according to a fourth embodiment;
• 6 a sectional view of a seal assembly according to the invention with a bearing element and a sealing device according to a fifth embodiment; and
• 7 a sectional view of a seal assembly according to the invention with a bearing element and a sealing device according to a sixth embodiment.

In the following description, like reference characters will be used for like items.

1 shows a sectional view of a seal assembly according to the invention 20 with a bearing element 21 and a sealing device 1 according to a first embodiment.

Shown in more detail 1 a seal arrangement 20 with a sealing device 1 , wherein first the sealing device 1 will describe.

The sealing device 1 for sealing a rolling bearing comprises a sealing portion 2 for sealing and a fixing section 3 for holding the sealing device 1 on a bearing element 21 ,

Here is the seal section 2 at one end of the attachment section 3 arranged. Furthermore, the sealing portion 2 opposite to the end of the attachment section 3 or to the attachment section 3 a free end e on.

Both sections 2 . 3 comprise a common carrier element 4 and a sealing element 5 , wherein the sealing portion 2 in the radial direction R and the attachment section 3 in radial R and in the axial direction A extend.

For the immediate concern of the support element 4 and the sealing element 5 on the bearing element 21 the attachment section extends 3 at least or at least partially in the axial direction A to by means of the carrier element 4 a clamping seat in the radial direction R to build.

This clamping seat serves to hold on the bearing element 21 , wherein at the same time by means of the sealing element 5 a static seal for sealing against the bearing element 21 is formed.

So that the support element 4 and the sealing element 5 directly on the bearing element 21 can be applied, these are - like 1 shows - in the axial direction A arranged one behind the other.

Thus, a secure static seal against the bearing element 21 be ensured, wherein in the radial direction R , from a rotation axis D the sealing device 1 directed outwards, the sealing element 5 the carrier element 4 in the attachment section 3 surmounted. This situation is in 1 optically not recognizable.

Furthermore, as already indicated, the sealing section extends 2 to the immediate concern of the support element 4 on the bearing element 21 in the radial direction R to by means of the carrier element 4 a stop for positioning on the bearing element 21 to build.

As 1 also shows, the sealing device 1 an extension 6 at the sealing section 2 on. This extension 6 is at the free end e of the sealing section 2 arranged and extends in the radial and axial directions R . A ,

This is the extension 6 from the sealing element 5 formed and further forms together with the sealing portion 2 and the attachment portion 3 a U-shaped cross section for receiving the bearing element 21 ,

Also shows 1 a seal arrangement 20 for a rolling bearing, in particular a wheel bearing arrangement, with a bearing element 21 and with a sealing device 1 ,

The bearing element 21 includes in the radial direction R an inner one IN THE and an outer circumferential surface AT THE as well as in the axial direction A a front side 22 covering the inner surface IN THE with the outer lateral surface AT THE combines.

For positioning the sealing device 1 is the sealing section 2 at the front 22 of the bearing element 21 and for holding the sealing device 1 is the attachment section 3 on the inner lateral surface IN THE of the bearing element 21 arranged.

This is the carrier element 4 and the sealing element 5 in the attachment section 3 the sealing device 1 directly on the inner lateral surface IN THE of the bearing element 21 at. Thus, by means of the carrier element 4 a clamping seat in the radial direction R for holding on the inner lateral surface IN THE of the bearing element 21 and by means of the sealing element 5 a static seal for sealing against the inner surface IN THE of the bearing element 21 educated.

As already mentioned, the sealing device comprises 1 at the free end e of the sealing section 2 an extension 6 , This is so from the sealing element 5 formed that between the extension 6 and the outer lateral surface AT THE of the bearing element 21 a sealing gap X resulting in a non-abrasive pre-seal between the extension 6 the sealing device 1 and the outer lateral surface AT THE of the bearing element 21 is formed.

2 shows a sectional view of a seal assembly according to the invention 20 with a bearing element 21 and a sealing device 1 according to a second embodiment. It shows 3 an enlargement 2 ,

Regarding the further embodiments will be to avoid unnecessary repetition to the first embodiment 1 referenced, which are analogously applicable here.

Therefore, only the differences between the first and second embodiments will be discussed below.

First, when comparing the 1 and 2 to hold that the bearing element 21 is configured differently, whereas the sealing device 1 identical in the 1 and 2 respectively. 3 is trained.

So is in 3 to recognize that the front side 22 of the bearing element 21 a first part 23 for the arrangement of the sealing section 2 the sealing device 1 and a second part 24 for forming a labyrinth seal.

This involves the second part 24 the front side 22 partly the sealing section 2 or the extension 6 to form a labyrinth seal.

To make it possible to embrace, the second part forms 24 the front side 22 an annular recess to communicate with the sealing portion 2 of the sealing device 1 to form a labyrinth seal.

The second part 24 the front side 21 includes a floor 25 , a first 26 and a second side part 27 ,

Here is the extension 6 partly within the second part 24 the front side 22 of the bearing element 21 or in the annular recess and at a distance to the ground 25 of the second part 24 the front side 22 arranged. In this way, an axial sealing gap Y between the extension 6 and the floor 25 by means of the first side part 26 of the second part 24 the front side 22 covered.

Thus, the labyrinth seal on the one hand of the sealing gap X and on the other of the sealing gap Y formed, both of them between the extension 6 and the surface of the second part of the front side 22 of the bearing element 21 are located.

Strictly speaking, even a third sealing gap is formed between the first side part 26 and the extension 6 located.

All in all, the labyrinth seal is from the sealing gap X , the sealing gap Y and the sealing gap between the first side part 26 and the extension 6 educated.

The labyrinth seal thus realizes a non-abrasive pre-seal between the extension 6 the sealing device 1 and the bearing element 21 ,

Further show 2 and 3 that the the outer shell surface AT THE the seal arrangement 1 a gutter 28 for collecting and draining a lubricant forms or comprises the bearing element 21 the gutter 28 ,

4 shows a sectional view of a seal assembly according to the invention 20 with a bearing element 21 and a sealing device 1 according to a third embodiment.

The third embodiment is very similar to the first embodiment, but with the difference that after 4 the bearing element 21 a gutter 28 for collecting and draining dirt, in which the extension 6 extends.

Furthermore, the third embodiment differs from the first in that the sealing gap X in radial R and axial direction A extends, whereas the sealing gap after 1 only in the radial direction R between the extension 6 and the outer lateral surface AT THE is trained.

The further comments on the first and second embodiments are analogously applicable to the third embodiment.

5 shows a sectional view of a seal assembly according to the invention 20 with a bearing element 21 and a sealing device 1 according to a fourth embodiment.

The fourth embodiment is very similar to the first embodiment, but has the difference that according to 4 the extension 6 is formed step-like.

Furthermore, the outer lateral surface follows AT THE of the bearing element 21 the shape of the extension 6 and is also stepped.

The other embodiments of the previous embodiments are analogously applicable to the fourth embodiment.

Due to the similarity of the embodiments according to the 6 and 7 these will be described together below and their differences explained.

6 shows a sectional view of a seal assembly according to the invention 20 with a bearing element 21 and a sealing device 1 according to a fifth embodiment.

7 shows a sectional view of a seal assembly according to the invention 20 with a bearing element 21 and a sealing device 1 according to a sixth embodiment.

The fifth and sixth embodiments are similar to the second embodiment of the 2 and 3 , but with the difference that the extension 6 together with the sealing section 2 and the attachment portion 3 the second part 23 the front side 22 of the bearing element 21 surrounds and the extension 6 a gutter 29 forms.

The gutter 29 is in the radial direction R formed open so that lubricant and / or impurities can be collected to prevent this from entering between the sealing device 1 and the bearing element 21 hold.

Similar to the embodiment of the 2 and 3 embraces the second part 24 the front side 22 partly the sealing section 2 or the extension 6 to form a labyrinth seal.

To make it possible to embrace, the second part forms 24 the front side 22 an annular recess to communicate with the sealing portion 2 the sealing device 1 to form a labyrinth seal.

The second part 24 the front side 21 includes a floor 25 , a first 26 and a second side part 27 ,

The embodiments of the 6 and 7 differ only by the shape of the gutter 29 as well as the second part 24 the front side 22 , which the sealing gap Y covered.

LIST OF REFERENCE NUMBERS

1

sealing device

2

sealing section

3

attachment section

4

support element

5

sealing element

6

extension

20

sealing arrangement

21

bearing element

22

front

23

first part of the front side

24

second part of the front side

25

Bottom of the second part of the front side

26

first side part of the second part of the front side

27

second side part of the second part of the front side

28

gutter

29

gutter

A

axial direction

D

axis of rotation

e

free end

R

radial direction

AT THE

outer jacket surface

IN THE

inner jacket surface

X

seal gap

Y

seal gap

Claims (8)

A sealing arrangement (20) for a wheel bearing arrangement, comprising a bearing element (21) and a sealing device (1) for sealing two bearing elements rotating about an axis (D) relative to one another, the sealing device (1) comprising: - a sealing section (2) for sealing, and - a fixing portion (3) for holding the sealing device (1) on a bearing member (21), - wherein the sealing portion (2) is disposed at one end of the fixing portion (3) and opposite to a free end (E) in which all sections (2, 3) have a common carrier element (4) and at least one sealing element (5), wherein all sections (2, 3) are in the radial direction (R) and / or in the axial direction (A) extend, - wherein the mounting portion (3) for immediate abutment of the support member (4) and the sealing element (5) on a bearing element (21) at least partially in the axial direction (A) extends to by means of the support member (4) a clamping seat in the radial direction (R) for holding on a bearing element (21) and by means of the sealing element (5) to form a static seal for sealing against a bearing element (21) - wherein the bearing element (21) in the radial direction ( R) an inner (IM) and an outer circumferential surface (AM) and in the axial direction (A) an end face (22) which connects the inner lateral surface (IM) with the outer lateral surface (AM), - wherein for positioning of the sealing device (1) the sealing portion (2) on the end face (22) of the bearing element (21) and for holding the sealing device (1) whose attachment portion (3) on the inner circumferential surface (IM) of the bearing element (21) is arranged, whereby the carrier element (4) and the sealing element (5) in the attachment portion (3) of the sealing device (1) directly against the inner circumferential surface (IM) of the bearing element (21), by means of the support member (4) has a clamping seat in the radial direction (R) Ha On the inner circumferential surface (IM) of the bearing element (21) and by means of the sealing element (5) to form a static seal for sealing against the inner circumferential surface (IM) of the bearing element (21). characterized in that - the end face (22) of the bearing element (21) comprises a first part (23) for arranging the sealing portion (2) of the sealing device (1) and a second part (24) for forming a labyrinth seal, - Part (24) of the end face (22) at least partially surrounds the sealing portion (2) to form a labyrinth seal, - wherein the second part (24) of the end face (22) forms an annular recess to communicate with the sealing portion (2) Sealing device (1) to form a labyrinth seal, - wherein the extension (6) at least partially within the second part (24) of the end face (22) of the Bearing member (21) and spaced from the second part (24) is arranged to cover an axial sealing gap (Y) between the extension (6) and the second part (24) of the end face (22). Seal arrangement according to Claim 1 , - wherein the support element (4) and the sealing element (5) for immediate contact with the bearing element (21) in the axial direction (A) are arranged one behind the other. Seal arrangement according to Claim 1 or 2 , - wherein in the radial direction (R), from a rotational axis (D) of the sealing device (1) directed outwards, the sealing element (5) the support element (4) in the attachment portion (3) surmounted to a secure static seal against a bearing element (21). Sealing arrangement according to one of Claims 1 to 3 , - wherein the sealing portion (2) for immediate abutment of the carrier element (4) on a bearing element (21) extends at least partially in the radial direction (R), by means of the carrier element (4) a stop for positioning on a bearing element (21). to build. Sealing arrangement according to one of Claims 1 to 4 - wherein the sealing device (1) has an extension (6) on the sealing portion (2) which extends in the radial and / or axial direction (R, A) and which is formed by the sealing element (5), - wherein the extension (6) together with the sealing portion (2) and the fixing portion (3) form a U-shaped cross section for receiving a bearing element (21), - wherein the extension (6) at the free end (E) of the sealing portion (2) is arranged , Seal arrangement according to Claim 1 , - wherein the sealing device (1) at the free end (E) of the sealing portion (2) comprises an extension (6) which is formed by the sealing element (5), that between the extension (6) and the outer lateral surface (AM ) of the bearing element (21) results in a sealing gap (X), whereby a non-abrasive pre-seal between the extension (6) of the sealing device (1) and the outer circumferential surface (AM) of the bearing element (21) is formed. Sealing arrangement according to one of Claims 1 to 6 - wherein the second part (24) of the end face (21) comprises a bottom (25), a first (26) and a second side part (27), - wherein the extension (6) at least partially within the second part (24) the end face (22) of the bearing element (21) and at a distance from the bottom (25) of the second part (24) of the end face (22) to an axial sealing gap (Y) between the extension (6) and the bottom (25 ) by means of the first side part (26) of the second part (23) of the end face (22) to cover. Sealing arrangement according to one of Claims 1 to 7 - wherein the bearing element (21) comprises a gutter (28) for collecting and draining a lubricant, - wherein the extension (6) in the gutter (28), - wherein the extension (6) is formed stepwise, - wherein the outer surface (AM) of the bearing element (21) follows the shape of the extension (6), - wherein the extension (6) forms a gutter (29), the gutter (29) being open in the radial direction (R), - Wherein the extension (6) together with the sealing portion (2) and the attachment portion (3) engages around the second part (23) of the end face (22) of the bearing element (21).

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